Cap for writing instruments



FIG. 1 is a perspective view of a cap for writing instruments, showing our new design, taken from the top right side;

FIG. 2 is a right side elevational view thereof, the left side elevational view being a mirror image thereto;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a cap for writing instruments, as shown and described. 